We incorporated advanced engineering for strength and ease of assembly, with an attractive oval design. Its dual thermostat heating unit is buried deep within super soft orthopedic foam and is removable for year round comfort. The heater is pre-set to keep the sleeping surface 12 to 15 above ambient air temperature and warms to a pet pleasing 102 with the kitty on it. Removable heater, washable cover. No tools are necessary for installation when using the provided Velcro fasteners. We also include screws for a more permanent attachment. Measures approx. 14" x 24"